Remotely access reserved capacity compute fleet MACOS device

Unfortunately, there is no direct way to remotely access the reserved capacity macOS machines used by AWS CodeBuild using screen sharing. The reserved capacity fleets for CodeBuild are designed to run builds in a managed environment, and they don't provide direct GUI access to the underlying macOS instances.

CodeBuild's reserved capacity fleets are optimized for running automated build and test processes. They are not intended for interactive use or direct access like you might have with an EC2 Mac instance. The machines in these fleets remain idle and ready to process builds, but they are not accessible for remote desktop or screen sharing sessions.

If you need to debug or interact with the build environment, you'll need to rely on CodeBuild's logging and reporting features. You can view build logs, configure additional logging, or use CodeBuild's local cache mechanism to investigate build issues.

For scenarios where you need direct GUI access to a macOS environment for development or testing purposes, you might consider using Amazon EC2 Mac instances instead. These instances allow you to connect using Apple Remote Desktop (ARD) or VNC clients that support ARD, giving you full GUI access to the macOS environment.
Sources
Add macOS to your continuous integration pipelines with AWS CodeBuild | AWS News Blog
Run builds on reserved capacity fleets - AWS CodeBuild